Musculoskeletal (MSK) pain is one of the main reasons patients see a pediatric rheumatologist. There are numerous causes for MSK pain and even those diagnosed with an inflammatory condition such as juvenile arthritis may have an underlying pain condition such as juvenile fibromyalgia syndrome (JFM). JFM is characterized by chronic musculoskeletal pain and symptoms such as fatigue, sleep disturbance, anxiety/depression. There is no objective diagnostic test and no validated classification criteria for JFM. The Pain and Symptom Assessment Tool (PSAT), based on the ACR adult fibromyalgia criteria and modified for pediatric use has shown promise for classification of JFM but needs more rigorous examination before it can be deployed in research and practice. This study will establish the validity and utility of an English and Spanish version of the PSAT. The long-term goal of this project is to offer a simple and standardized approach to classifying JFM with the assistance of a validated screening tool to promote optimal treatment for this potentially disabling condition.